(undo-tree-save-format-version . 1)
"9b3f6b2ab75ef03a815fed830b47ecbc0ba5095d"
[nil nil nil nil (25163 46991 337195 766000) 0 nil]
([nil current ((1 . 2109) (t . 0)) nil (25163 46991 337191 638000) 0 nil])
nil